Needle bar



. A. LOIMANN Jan. 26, 1937.

NEEDLE BAR Filed Aug. 21, 1956 lvvvevz'or: A721272 Lo/ mann 5) Affe/maf l Patented Jan. 26, 1937 UNITED STATES PATENT OFFICE Application August 21, 1936, Serial No. 97,293 In Germany August 23, 1935 1 Claim.

This invention relates to improvements n needle bars for iiat hosiery machines, more especially for common hosiery frames, the needle bar being shaped to form a kind of girder or beam stiiened by ribs.

The object of the present invention is to reduce the weight of the needle bars more than possible with the old needle bars of this kind thus diminishing the motive power required for moving the needle bars and keeping the machine even when running at full speed free from disturbing vibrations. This object is attained by shaping the needle bar proper to form a boxshaped girder provided with ribs arranged in the interior of the b ox so as to form a lattice work. Furthermore at the points of intersection of the ribs holes are provided for letting the screw bolts belonging to the covers pass through, and at the underside of the box-shaped girder the bearing eyes are attached by casting in such a manner that at the points of junction the walls of the bearing eyes have approximately the same thickness as the walls of the box-shaped girder. When such needle bar is made of a light-metal zo alloy as in itself is usual in the art it is considerably lighter than a common needle bar. Regarding the fact that the needle bars in Working a flat hosiery frame are moved in horizontal and vertical direction by jerks, this involves con- 30 siderable saving of motive power and essentially diminishes the risk of the vibrations of the Inachine increasing to an annoying extent. rFherefore a machine provided with needle bars according to the present invention may be run with 35 higher speed than possible with the old needle bars under similar conditions.

The invention is illustrated by Way of example in the annexed drawing of which Fig. 1 is a front View and 40 Fig. 2 is a side view of a needle bar constructed according to the present invention.

The needle bar consists of a box-shaped hollow body formed by a front wall l, the upper and the lower longitudinal walls 2 and 3 respectively, and the side walls ll and 5 respectively. In the horizontal middle-line of this box-shaped 5 girder a plurality of fastening eyes 6 is provided through which the screw-bolts extend by which the covers 9 for fastening the needles are attached to the needle bar. A number of stiffening ribs 1 extend from each of the eyes 6 10 to the upper and lower walls 2 and 3.

Hereby the strength of flexure and torsion of the needle bar is considerably increased so that it becomes possible to reduce the thickness of the Walls of the box-shaped girder corre- 15 spondingly.

In order to journal the needle bar at the holding and driving levers all otherwise required connecting members are dispensed with and four bearing eyes 8, oiset in pairs, are attached by 20 casting to the underside of the wall 3 so that the thickness of the walls of the bearing eyes approximately equals that of the box-shaped girder. I have ascertained that this thickness is quite suiicient in spite of the stresses which may occur at the points of junction.

The needle bar is preferably made of aluminum or a light metal alloy.

A girder-like needle bar stiiened by ribs for iiat hosiery machines, which needle bar forms a box-shaped girder and is stiiened at its inside by lattice work ribs, cavities being provided at the points of intersection of the said ribs, cavities for letting the screw bolts, belonging to the covers, pass through, and bearing eyes being attached by casting to the underside of the girder, the thickness of the walls of the bearing eyes approximating that of the girder walls.

ANTON LOIMANN. 

